Special cases with rapidly flashing LEDs (approx. 5 Hz):
● All 4 LEDs flash rapidly: An incorrect S500 module is connected to the device. The device
fails to initialize.
● The LEDs of the CS31 bus, S-ERR bus and I/O bus flash rapidly: Invalid position of DIP
switches. The device fails to initialize.
● The LEDs of the S-ERR bus and I/O bus flash rapidly: A checksum error occurred in an
internal Flash memory.
● The LED of the I/O bus flashes rapidly: An error occurred in an internal RAM.
Table 57: LEDs of the S500 module AI523
LED
Status
Color
LED off
LED on
LED flashes
I1+, I3+, I5+,
I7+ (see No. 1
in the fol-
lowing figure)
Analog inputs Yellow
Input is not
activated
Input is acti-
vated (bright-
ness depends
on value of
analog
signal).
-
I9+, I11+,
I13+, I15+
(see no. 2 in
the following
figure)
Analog inputs Yellow
Input is not
activated
Input is acti-
vated (bright-
ness depends
on value of
analog
signal).
-
Error indica-
tion left (see
No. 3 in the
following
figure)
Error indica-
tion
Red
No error
Internal error
Cut wire on a
channel of the
corresponding
group
Error indica-
tion right (see
No. 3 in the
following
figure)
Error indica-
tion
Red
No error
Internal error
Cut wire on a
channel of the
corresponding
group
Indication
supply voltage
(see No. 4 in
the following
figure)
Process
voltage
Green
Process
voltage not
available
Process
voltage OK
-
AC31 Adapters
Replacement devices: I/O modules > Replacement device 07AI91-AD
2018/09/24
3ADR010122, 8, en_US
102
